What does 'b' stand for in PostgreSQL's JSONB data type?

While not a technical question per se, I'm curious about the actual meaning of _b_ in PostgreSQL's jsonb data type. I skimmed through the official documentation but I couldn't figure it out. As far I can tell, there is no explicit mention of what _b_ actually means. One would assume that it stands for _binary_, since that is one of the main differences between jsonb and plain-old json. Most articles and LLM-generated responses take for granted that it means _binary_. I've found articles , however, that refer to it as _better_. According to the official documentation, jsonb is more than just a binary encoding of a JSON object, therefore, _better_ might be a slightly more fitting description. Does anybody know the story behind jsonb's naming?